Table 3. Correlations between age and BP_ND of [¹¹C]-Raclopride.

	Globus pallidus	Ventral striatum	Caudate	Putamen
Correlations between age and BPND of [11C]-Raclopride
r	−0.08	−0.43	−0.50	−0.41
P-value	0.52	<0.001	<0.001	<0.001
Partial correlations between age and BPND of [11C]-Raclopride controlling for gender
r	−0.04	−0.41	−0.49	−0.39
P-value	0.77	<0.001	<0.001	0.001

BP_ND, binding potential nondisplaceable. Correlation analyses were performed to determine the association between age and BP_ND with [¹¹C]-Raclopride in each region, including the substantia nigra and hypothalamus, which represent specific D₃ receptor regions, the globus pallidus and ventral pallidum, which represent preferential D₃ receptor regions, and the caudate and putamen, which represent specific D₂ receptor regions. Partial correlation analyses were performed to determine the association between age and BP_ND with [¹¹C]-Raclopride in each region, controlling for gender. The numbers of subjects were 70 for each region. Bold characters=statistically significant.